Metallic bonding and alloysIB MYP Chemistry: Flashcards

What these 13 flashcards ask

What is metallic bonding?
What does delocalised mean?
What particles make up the lattice of a metal?
Why do metals conduct electricity?
What does malleable mean?
Why are metals malleable?
What is an alloy?
Give two examples of alloys.
What is steel made of?
What is brass made of?
Why are alloys harder than pure metals?
In a pure metal, why can the layers slide easily?
Which particles move when a metal conducts electricity?

Exam questions on Metallic bonding and alloys

An electrician in Johannesburg chooses copper for the electrical cables in a new school building because copper conducts electricity very well. Copper is a metal.
Describe the structure of a metal such as copper.2 marks
A craftsperson in Marrakech hammers a flat sheet of copper into a bowl. The copper changes shape without cracking or breaking.
Explain why the copper changes shape without breaking.2 marks
A student compares the hardness of pure copper with brass, an alloy of copper and zinc. She drops the same steel ball bearing from the same height onto a strip of each metal and measures the diameter of the dent. She does three trials on each strip. The dents in copper measured 3.5 mm, 3.4 mm and 3.3 mm. The dents in brass measured 2.2 mm, 2.0 mm and 2.1 mm.
Calculate the mean dent diameter for each metal and state which metal is harder, giving a reason.3 marks

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).